NTT DOCOMO and NEC completed interoperability testing for 5G standalone (SA) using a 5G base station baseband unit (5G CU/DU) conforming to O-RAN open interface specifications and radio units (RUs) of different vendors.The multi-vendor interoperability test used a software upgrade to introduce SA capability to NEC's 5G non-standalone (NSA) CU/DU operating on DOCOMO's commercial network. As a result, the system was transformed from a 5G NSA system...